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| All Patents in class 474/7 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 273,329 | Mar. 06, 1883 | E. Weston | Method of Controlling the Electrical Transmission of Power | ||
| 789,198 | May 09, 1905 | A.A. Ambler | Mill | ||
 | 948,825 | Feb. 08, 1910 | A.C. Pletz | Change-speed and reverse-drive mechanism | |